I am told that PPR is due to the limited experience of the FISOs and the limited amount of parking space for aircraft. It also operates under an 'ordinary' licence' the meaning of which is no doubt understood by all the experts on here! Perhaps if all the visiting pilots comply with the prior booking requirement, this will enable the FISOs to cope with the traffic more efficiently.
I've got one word for this. It begins with Boll and ends with ocks!
We aren't talking about Heathrow here! Or even Perth or Cumbernauld to be honest...........